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Clinical Chemistry 29: 120-125, 1983;
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Clinical Chemistry, Vol 29, 120-125, Copyright © 1983 by American Association for Clinical Chemistry

Immunonephelometric determination of apolipoprotein A-1 in hyperlipoproteinemic serum

CC Heuck, I Erbe and P Flint-Hansen

The intensity of scattered light varies with the size of the scattering particles. Studying the quantitative immunonephelometric determination of apolipoprotein A-1 (apo A-1), we observed that the different particle sizes of lipoproteins must be taken into account in immunonephelometry if apo A-1 is a constituent of the lipoprotein particles. Because interaction between large lipoproteins and immunocomplexes of high-density lipoproteins increases light scattering nonspecifically, false estimations may be obtained in serum with excessive hyperlipoproteinemia. Furthermore, the accessibility of antigenic sites of apo A-1 in intact high-density lipoproteins is limited. Immunonephelometry of apo A-1 in serum necessitates therefore the elimination of various interferents, which we have achieved by a single one-step extraction of lipids in a two-phase liquid system. With n-hexanol/polyfluoro-polychloro-polyethylene, about 90% of the serum lipids are extracted and only apolipoprotein B is precipitated at the interphase. This pretreatment eliminates the interferences caused by excessive hypertriglyceridemia and therefore greatly facilitates the endpoint immunonephelometry of apo A-1 in normal and pathological serum samples.


The following articles in journals at HighWire Press have cited this article:


Home page
 Clin. Chem.Home page
M. Porsch-Ozcurumez, S. Westphal, and C. Luley
Measurement of Low Apolipoprotein Concentrations by Optimized Immunoturbidimetric Applications
Clin. Chem., March 1, 2001; 47(3): 594 - 597.
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Copyright © 1983 by the American Association for Clinical Chemistry.